1856.] 211 



too, in which there is " only four or five compressed and hooked teeth in each 

 main row, and one or two in a second row." What is really of generic value 

 is left for us to conjecture, since we are not in possession of its typical species. 



The generic characters which we now offer are based upon Leu ciscus star erianus 

 and a new species from Alabama, and should they prove generally distinct from 

 H. gracilis, a new name will have to be coined for our species. 



Body elongated, compressed, subfusiform in profile, covered with rather 

 large scales. The lateral line being straight, along the middle of the flanks. 

 The head is of moderate size, subconical and rounded upon the snout which 

 protrudes beyond the lower jaw. A barbel, inserted upon the anterior margin 

 of the posterior extremity of the maxillar}', maj' he seen at the angle of the 

 mouth. The eyes are large, th'e isthmus narrow. The dorsal is a little higher, 

 and the anal deeper, than long. The insertion of the ventrals takes place 

 opposite the second ray of the dorsal, hence very nearly under its anterior 

 margin. The tail is deeply furcated. The pharyngeal bones have the same 

 form and appearance as in Hudsonius ; the teeth are likewise of the same kind 

 (bruising) and type (hooked with a grinding surface), but more irregular yet. 

 Sometimes not hooked, the grinding surface contorted and nearly absent, or 

 even resembling a truncated cone. They are disposed upon a double row of 

 four and one : 1 | 4 4 | 1, or j 4 4 | 1. 



This genus, it will appear, is intimately related to Hudsonius, from which it 

 chiefly differs by the presence of barbels at the angle of the mouth, and by its 

 straight lateral line also. 



1. Hybopsis storerianus. Rutilus Sioreriamis, Kirtl. Proc. Bost. Soc. Nat. 

 Hist. I. 1842, 71. Leuciscus storeriaiius, Kirtl. Bost. Journ. Nat. Hist. V. 1845, 

 30. PL ix. fig. 2. STORER,-Synops. 1846, 265. 



From Marietta, Ohio. Prof. E. B. Andrews; Eussellville, Ky. Dr. Shumard 



2. Hybopsis winciielli. It is a shorter and more contracted species than 

 the preceding. The head forming but the fifth of the total length, whilst 

 it constitutes the sixth in II. storerianus. The eye and mouth are also larger ; 

 the same is the case with the scales. The color is pale red with a silvery streak 

 along the middle of the flanks. 



From Black Warrior River, Ala. Prof. A. Winchell. 



' I 



CLINOSTOMUS. 



A genus instituted to include several new species, together with one pre- 

 viously described as a Leuciscus. Its characters are as follows : Body elongated, 

 compressed, subfusiform in profile. The head is compressed like the body, the 

 frontal surface being very declivous and sloping towards a pointed rostrum, so 

 that in profile the head is subtriangular, and if broader, would be wedge-shaped 

 when seen from above. The mouth is very large, the lower jaw longer than 

 the upper, beyond which it protrudes, giving to the cleft an oblique direction 

 upwards. The eye is very large ; the isthmus, quite narrow. The dorsal is 

 higher than long, and inserted on the space between the ventrals and the anal, 

 a little nearer to the former than the latter in a vertical line. The caudal is 

 deeply furcated. The scales are of but moderate development, varying con- 

 siderably in size between the different species. The lateral line forms a down- 

 wards curve upon the abdomen so as to bring its convexity nearer to the ventral 

 than the dorsal outline. The pharyngeal bones are rather slender, the lower 

 limb especially; a slight expansion may be observed upon their convexity; the 

 upper limb being flattened, bent inwardly and either shorter or of equal length 

 with the lower limb. The teeth are of the raptatorial kind, of the hooked type 

 without grinding surface, and disposed thus : 2 | 4 4 | 2, or 2 | 5 4 | 2, and 

 sometimes 1 | 4 4 | 2. 



This genus is more closely related to Ptychocheilus than to any other of the 

 family. The pharyngeal teeth are constructed upon the same pattern ; the 

 chief difference being found in the inclined cleft of the mouth, and the pro- 

 trusion of the lower jaw beyond the upper. 



